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ext4: mballoc: don't replace the current preallocation group unnecessarily

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In ext4_mb_check_group_pa(), the current preallocation space is
replaced with a new preallocation space when the two have the same
distance from the goal block.

This doesn't actually gain us anything, so change things so that the
function only switches to the new preallocation group if its distance
from the goal block is strictly smaller than the current preallocaiton
group's distance from the goal block.

Signed-off-by: Coly Li <bosong.ly@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Coly Li 2011-02-24 14:10:05 -05:00 committed by Theodore Ts'o
parent 58696f3ab2
commit 5a54b2f199
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/mballoc.c
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@ -3213,7 +3213,7 @@ ext4_mb_check_group_pa(ext4_fsblk_t goal_block,
cur_distance = abs(goal_block - cpa->pa_pstart);
new_distance = abs(goal_block - pa->pa_pstart);
if (cur_distance < new_distance)
if (cur_distance <= new_distance)
return cpa;
/* drop the previous reference */